This amp clamp won't stay in place for long.
I've attached it to my amp and tried it with a really light mic but even so it always starts bending down after a while.
I'd suggest you spend some extra money and buy something more sturdy...
It's easy to attach and all but it's purpose, which is to keep the mic in place in your amp, fails completely.
Anyway, if you're still interested in this piece of clamp, the flexible tube can be dettached and swapped for something sturdier. I think they sell that separate part, but I haven't look it up yet.
I hope this review helps. Have a good day!